Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012	Dec. 31, 2012	Mar. 31, 2013 Research and Development Tax Credit [Member]
Tax Credit Carryforward [Line Items]
Increase (decrease) in tax expense upon the expiration of the statutes of limitation for certain reserves for income tax uncertainties	$ (1,790,000)	$ (441,000)
Increase (decrease) in tax expense for the final true-up of the prior year's tax accrual upon filing the actual tax returns	267,000	84,000
Reduction in tax expense						555,000
Effective discrete tax rate	19.00%	21.00%	19.00%	21.00%
Provision for effective tax rate	13.00%	19.00%	16.00%	20.00%
Increase (decrease) in liabilities, net of deferred tax benefit, for uncertain tax positions			(679,000)
Income tax expense benefit on uncertain tax position	1,597,000
Increase (decrease) in interest and penalties	911,000		834,000
Reserve for income taxes, total	4,390,000		4,390,000		5,216,000
Interest and penalties, gross	297,000		297,000
Reserve for income taxes to be recorded in additional paid in capital			361,000
Minimum decrease in income tax expense due to release in reserves			450,000
Maximum decrease in income tax expense due to release in reserves			$ 550,000
Tax years open to examination by various taxing authorities			2010 through 2012
Tax years open to examination by various taxing authorities for other entities			2009 through 2012
Tax years currently under audit by internal revenue service for U.S. federal returns			2010 and 2011